EP2293041A2 - Spécimen de test pour tester des propriétés d'épaisseur traversante - Google Patents

Spécimen de test pour tester des propriétés d'épaisseur traversante Download PDF

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Publication number
EP2293041A2
EP2293041A2 EP10172598A EP10172598A EP2293041A2 EP 2293041 A2 EP2293041 A2 EP 2293041A2 EP 10172598 A EP10172598 A EP 10172598A EP 10172598 A EP10172598 A EP 10172598A EP 2293041 A2 EP2293041 A2 EP 2293041A2
Authority
EP
European Patent Office
Prior art keywords
loading
test specimen
test
portions
axis
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP10172598A
Other languages
German (de)
English (en)
Other versions
EP2293041B1 (fr
EP2293041A3 (fr
Inventor
Robert Gerlach
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rolls Royce PLC
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Rolls Royce PLC
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Publication date
Application filed by Rolls Royce PLC filed Critical Rolls Royce PLC
Publication of EP2293041A2 publication Critical patent/EP2293041A2/fr
Publication of EP2293041A3 publication Critical patent/EP2293041A3/fr
Application granted granted Critical
Publication of EP2293041B1 publication Critical patent/EP2293041B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02—Details
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/026—Specifications of the specimen
    • G01N2203/0262—Shape of the specimen
    • G01N2203/0272—Cruciform specimens
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/026—Specifications of the specimen
    • G01N2203/0298—Manufacturing or preparing specimens
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49995—Shaping one-piece blank by removing material

Definitions

  • the present invention relates to a test specimen, and a method of testing a specimen - in particular, a composite test specimen - and a method of manufacturing such a specimen.
  • Fiber-Reinforced-Polymer (FRP) composites comprising fibres embedded in a polymeric matrix system, are commonly used for many engineering applications. They can be classified into uni-directional (UD), two-dimensional (2D) and three-dimensional (3D) composites. Composites can offer certain advantages over conventional materials such as a high strength to weight ratio. However, physical properties of FRPs tend not to be isotropic. It is therefore necessary to be able to characterise the various physical properties of fibre-reinforced composites in a number of directions.
  • FRP Fibre-Reinforced-Polymer
  • Figure 1 shows a previously considered method of testing the tensile strength of UD and 2D FRP plates in the through-thickness direction.
  • a test specimen 1 is provided that has a gauge section 2 having a reduced cross-sectional area.
  • Metal end caps 3 are bonded to the ends of the specimen using an adhesive 4.
  • a tensile force is then applied between the end caps 3 and this force is transmitted to the specimen through the adhesive bond 4.
  • the adhesive bond 4 may be weaker then the composite. It is therefore necessary to produce a test specimen 1 that has a gauge section 2 having a cross-sectional area that is sufficiently smaller than the area of the adhesive bonds so as to ensure that the gauge section 2 fails in tension, not the adhesive bond 4.
  • Embodiments of the present invention aim to address at least some of the above problems.
  • test specimen for testing the through-thickness properties of a fibre-reinforced composite material, a method of manufacturing such a specimen, and a method of testing such a specimen, as set out in the claims.
  • the invention may comprise any combination of the features and/or limitations referred to herein, except combinations of such features as are mutually exclusive.
  • a test specimen 6 comprises a generally cruciform, single piece of fibre-reinforced composite material.
  • the piece of composite material comprises a first upper loading portion 10, a second lower loading portion 20 and a test gauge portion 30 that are integral.
  • the first and second loading portions 10, 20 are in the form of elongate rectangular planar portions.
  • the loading portions 10, 20 are planar and parallel to one another and are orientated perpendicular to one another such that they overlap at a mid-point.
  • the test gauge portion 30 has a square cross-section in a plane parallel to the loading portions 10, 20, that has dimensions equal to the width of the loading portions 10, 20.
  • the transition between the loading portions 10, 20 and the test gauge portion 30 is filleted in order to reduce stress concentrations.
  • the first and second loading portions 10, 20 extend either side of the gauge portion 30 along first and second perpendicular axes respectively. This provides first and second loading surfaces 12, 14 on the first loading portion 10 and third and fourth loading surfaces 22, 24 on the second loading portion 20.
  • the test specimen is manufactured from a small thin rectangular composite plate 40.
  • two prismatic side pieces 42, 44 are machined from the top surface of the plate 40, either side of the plate 40. These pieces 42, 44 are substantially rectangular and have a thickness that is less than that of the plate 40. This means that a lower loading portion 20 is formed which extends either side of a central portion 46 ( Figure 5C ).
  • two prismatic side pieces 48, 50 are then machined from the lower surface of the plate 40, either side of the plate 40. These pieces 48, 50 are of a similar dimension to the prismatic side pieces 42, 44 but extend in a direction perpendicular to the prismatic side pieces 42, 44.
  • the above steps result in the formation of a cruciform test specimen 6 as described above having first and second loading portions 10, 20 and a test gauge portion 30.
  • Any suitable machining method can be used such as grinding using a silicon carbide wheel.
  • Figure 6 shows an apparatus for testing the tensile strength of the composite test specimen 6.
  • a lower U-shaped rig 60 and an upper U-shaped rig 66 are used to apply a tensile force to the test gauge portion 30 of the specimen 6.
  • the lower U-shaped rig 60 applies an upwards force to the first upper loading portion 10 and the upper U-shaped rig 66 is used to apply a downwards force to the second lower loading portion 20.
  • the end faces 62, 64 of the lower rig 60 apply equal forces to the first and second loading surfaces 12, 14 of the first upper loading portion 10 and the end faces 68, 70 of the upper rig 66 apply equal forces to the loading surfaces 22, 24 of the second lower loading portion 20.
  • These forces can be achieved by applying a compressive force between the upper and lower rigs 60, 66, which generates a tensile stress state in the test gauge portion 30.
  • Figure 7 shows schematically an experimental assembly using the apparatus of Figure 5 .
  • Steel balls 72, 74 are placed above and below the rigs 60, 66 and a compressive force is applied between them.
  • the steel balls 72, 74 ensure that the force is applied perpendicular to the face of the upper and lower rigs 60, 66.
  • the composite can then be tested to failure to determine the tensile strength of the composite.
  • Figure 8 shows an embodiment in which steel beams (or plates) 76, 78 are adhesively bonded to the upper surface of the first upper loading portion 10 and to the lower surface of the second lower loading portion 20. This reduces the tendency of the loading portions 10, 20 to bend.
  • the incidence of stress concentrations, in the region of the transition from the loading portions 10, 20 to the gauge portion 30, is reduced as compared to the above-described embodiment.
  • the disadvantage of such bending and stress concentrations is that they can give rise to peeling in the loading portions of the test specimen, so that the test result will not accurately reflect the through-thickness properties of the test specimen.
  • test specimen 6 When the test specimen 6 is loaded in the through-thickness direction in tension, it fails in the gauge section 30.
  • the tensile force is transmitted into the gauge section 30 through the crossing of the loading portions 10, 20 without using an adhesive bond, therefore preserving the reinforcing effect of the through-thickness reinforcement.
  • test specimen 6 can be tested to tensile failure in the through-thickness direction, even if the composite is highly reinforced.
  • test specimen 6 can also be produced with ease using the manufacturing technique described above. This requires only a small amount of composite material, so a large number of test specimens can be manufactured from a small amount of starting material.
  • test specimen 6 can be easily used with split Hopkinson compression bars; this enables the characterisation of the through-thickness properties of the composite at high strain rates.

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
  • Sampling And Sample Adjustment (AREA)
EP10172598.4A 2009-08-18 2010-08-12 Spécimen de test pour tester des propriétés d'épaisseur traversante Not-in-force EP2293041B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GBGB0914365.2A GB0914365D0 (en) 2009-08-18 2009-08-18 Test speciment and method of manufacturing testing

Publications (3)

Publication Number Publication Date
EP2293041A2 true EP2293041A2 (fr) 2011-03-09
EP2293041A3 EP2293041A3 (fr) 2013-01-09
EP2293041B1 EP2293041B1 (fr) 2015-02-18

Family

ID=41171508

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10172598.4A Not-in-force EP2293041B1 (fr) 2009-08-18 2010-08-12 Spécimen de test pour tester des propriétés d'épaisseur traversante

Country Status (4)

Country Link
US (1) US8650975B2 (fr)
EP (1) EP2293041B1 (fr)
CN (1) CN102004050B (fr)
GB (1) GB0914365D0 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110779799A (zh) * 2019-11-20 2020-02-11 青岛滨海学院 一种热管理复合材料拉伸测试样品及其制备方法
WO2020087102A1 (fr) * 2018-10-31 2020-05-07 Technische Universität Wien Procédé et moyens de test de la résistance d'une liaison entre deux éléments de test

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102252896A (zh) * 2011-04-21 2011-11-23 西北工业大学 一种测试复合材料层合厚板拉压性能的两侧面直腰形试样
ITSA20120008A1 (it) * 2012-05-16 2012-08-15 Univ Degli Studi Salerno Dispositivo per le prove di resistenza alla frattura per modo iii su giunzioni incollate
NL2010556C2 (en) * 2013-04-03 2014-10-06 Onderzoekscentrum Voor Aanwending Van Staal N V Fatigue testing of a test specimen.
USD722900S1 (en) * 2013-11-04 2015-02-24 King Tester Corporation Metal hardness tester block having an alphanumeric platted grid
CN106153476B (zh) * 2016-08-09 2018-09-11 宁波中加低碳新技术研究院有限公司 木材滚动剪切模量和强度的测试方法
CN109297811A (zh) * 2018-09-28 2019-02-01 西北工业大学 双轴双向压缩加载装置及其方法

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JPS58173450A (ja) 1982-04-06 1983-10-12 Taiyo Kogyo Kk ２軸引張試験機
FR2579327B1 (fr) 1985-03-22 1987-06-26 Centre Nat Rech Scient Dispositif perfectionne d'essais de traction biaxiale
SU1415124A1 (ru) 1986-12-15 1988-08-07 Ленинградский инженерно-строительный институт Установка дл двухосного раст жени крестообразных образцов композитных материалов
US4850715A (en) * 1987-09-01 1989-07-25 Gaffin Norman H Dual material test specimen
US4895027A (en) * 1988-01-19 1990-01-23 Battelle Development Corporation Determining plane strain fracture toughness and the J-Integral for solid materials using stress field modified miniature specimens
DE3914966C2 (de) * 1989-05-03 1996-01-11 Inpro Innovations Gmbh Kreuzförmige, ebene Probe, insbesondere aus Blech für eine zweiachsige Materialprüfung im Bereich großer Dehnung
EP0660100A3 (fr) 1993-12-10 1996-02-21 Inst Michanikis Ylikon Kai Geo Echantillon pour obtenir une distribution uniforme des contraintes et des efforts triaxiale en tension à une temperature basse ou élevée.
JP4150383B2 (ja) * 2004-04-13 2008-09-17 新日本製鐵株式会社 スポット溶接部の破断予測装置、方法、コンピュータプログラム、及びコンピュータ読み取り可能な記録媒体
GB0713047D0 (en) * 2007-07-06 2007-08-15 Airbus Uk Ltd Method and apparatus for testing composite materials

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020087102A1 (fr) * 2018-10-31 2020-05-07 Technische Universität Wien Procédé et moyens de test de la résistance d'une liaison entre deux éléments de test
US20210372896A1 (en) * 2018-10-31 2021-12-02 Technische Universitat Wien Method and means for testing the strength of a bonding between two specimen elements
US12013375B2 (en) * 2018-10-31 2024-06-18 Technische Universitat Wien Method and means for testing the strength of a bonding between two specimen elements
CN110779799A (zh) * 2019-11-20 2020-02-11 青岛滨海学院 一种热管理复合材料拉伸测试样品及其制备方法
CN110779799B (zh) * 2019-11-20 2022-08-19 青岛滨海学院 一种热管理复合材料拉伸测试样品及其制备方法

Also Published As

Publication number Publication date
CN102004050B (zh) 2015-08-12
EP2293041B1 (fr) 2015-02-18
GB0914365D0 (en) 2009-09-30
US8650975B2 (en) 2014-02-18
US20110041627A1 (en) 2011-02-24
CN102004050A (zh) 2011-04-06
EP2293041A3 (fr) 2013-01-09

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